Mostly just generalizing customization.

Makefile

@@ -0,0 +1,16 @@
+
+dir  = $(HOME)/.zsh/git-prompt
+src += gitstatus.py
+src += zshrc.sh
+dst  = $(addprefix $(dir)/, $(src))
+
+.PHONY: install
+
+install: $(dir) $(dst)
+
+$(dir):
+	mkdir -vp $(dir)
+
+$(dir)/%: %
+	sudo install -m 0444 $< $@
+

README.rst

@@ -64,4 +64,16 @@ Install
 #. You may also redefine the function ``git_super_status`` (after the ``source`` statement) to adapt it to your needs (to change the order in which the information is displayed).  Define the variable ``ZSH_THEME_GIT_PROMPT_NOCACHE`` in order to disable caching.  You may also change a number of variables (which name start with ``ZSH_THEME_GIT_PROMPT_``) to change the appearance of the prompt.  Take a look in the file ``zshrc.sh`` to see how the function ``git_super_status`` is defined, and what variables are available.
 #. Go in a git repository and test it!
 
+Customization
+-------------
+
+The following parameters may be set prior to sourcing ``zshrc.sh``.
+
+* ``GIT_PROMPT_DIR`` -- directory in which to find ``gitstatus.py``
+* ``ZSH_THEME_GIT_PROMPT_BRANCH_COLOR`` -- prompt color for branch
+* ``ZSH_THEME_GIT_PROMPT_STAGED_COLOR`` -- prompt color for staged
+* ``ZSH_THEME_GIT_PROMPT_CONFLICTS_COLOR`` -- prompt color for conflicts
+* ``ZSH_THEME_GIT_PROMPT_CHANGED_COLOR`` -- prompt color for changed
+* ``ZSH_THEME_GIT_PROMPT_CLEAN_COLOR`` -- prompt color for clean
+
 **Enjoy!**

zshrc.sh

@@ -1,10 +1,23 @@
 # To install source this file from your .zshrc file
 
+if ! which python > /dev/null
+then
+   # If we don't have python, then create a stub and return.
+   git_super_status() { }
+   return
+fi
+
 # Change this to reflect your installation directory
-export __GIT_PROMPT_DIR=~/.zsh/git-prompt
-# Initialize colors.
-autoload -U colors
-colors
+: ${GIT_PROMPT_DIR:=$HOME/.zsh/git-prompt}
+export __GIT_PROMPT_DIR=$GIT_PROMPT_DIR
+
+# Commonly, colors is already loaded.
+if [[ -z $color ]]
+then
+   # Initialize colors.
+   autoload -U colors
+   colors
+fi
 
 # Allow for functions in the prompt.
 setopt PROMPT_SUBST
@@ -80,16 +93,22 @@ git_super_status() {
 	fi
 }
 
+: ${ZSH_THEME_GIT_PROMPT_BRANCH_COLOR:=$fg_bold[magenta]}
+: ${ZSH_THEME_GIT_PROMPT_STAGED_COLOR:=$fg[red]}
+: ${ZSH_THEME_GIT_PROMPT_CONFLICTS_COLOR:=$fg[red]}
+: ${ZSH_THEME_GIT_PROMPT_CHANGED_COLOR:=$fg[red]}
+: ${ZSH_THEME_GIT_PROMPT_CLEAN_COLOR:=$fg_bold[green]}
+
 # Default values for the appearance of the prompt. Configure at will.
 ZSH_THEME_GIT_PROMPT_PREFIX="("
 ZSH_THEME_GIT_PROMPT_SUFFIX=")"
 ZSH_THEME_GIT_PROMPT_SEPARATOR="|"
-ZSH_THEME_GIT_PROMPT_BRANCH="%{$fg_bold[magenta]%}"
-ZSH_THEME_GIT_PROMPT_STAGED="%{$fg[red]%}●"
-ZSH_THEME_GIT_PROMPT_CONFLICTS="%{$fg[red]%}✖"
-ZSH_THEME_GIT_PROMPT_CHANGED="%{$fg[blue]%}✚"
+ZSH_THEME_GIT_PROMPT_BRANCH="%{$ZSH_THEME_GIT_PROMPT_BRANCH_COLOR%}"
+ZSH_THEME_GIT_PROMPT_STAGED="%{$ZSH_THEME_GIT_PROMPT_STAGED_COLOR%}●"
+ZSH_THEME_GIT_PROMPT_CONFLICTS="%{$ZSH_THEME_GIT_PROMPT_CONFLICTS_COLOR%}✖"
+ZSH_THEME_GIT_PROMPT_CHANGED="%{$ZSH_THEME_GIT_PROMPT_CHANGED_COLOR%}✚"
 ZSH_THEME_GIT_PROMPT_REMOTE=""
 ZSH_THEME_GIT_PROMPT_UNTRACKED="…"
-ZSH_THEME_GIT_PROMPT_CLEAN="%{$fg_bold[green]%}✔"
+ZSH_THEME_GIT_PROMPT_CLEAN="%{$ZSH_THEME_GIT_PROMPT_CLEAN_COLOR%}✔"